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Underground coal gasification is a conversion and extraction process, for the production of useful synthetic product gas from an in-situ coal seam, to use in power generation, heat production or as a chemical feedstock. While many variants of the underground coal gasification process have been considered and over 75 trials performed throughout the world, the recent work has tended to focus on the control of the process, its environmental impact on underground and surface conditions and its potential for carbon capture and storage. Academic research has produced a set of mathematical models of underground coal gasification, and the European Union-supported programme has addressed the production of a decarbonised product gas for carbon capture and storage. In recent years, significant progress has been made into the modelling of tar formation, spalling, flows within the cavity and the control of minor gasification components, like BTEX and phenols, from underground coal gasification cavities (BTEX refers to the chemicals benzene, toluene, ethylbenzene and xylene). The paper reviews the most recent underground coal gasification field trial and modelling experience and refers to the pubic concern and caution by regulators that arise when a commercial or pilot-scale project seeks approval. It will propose solutions for the next generation of underground coal gasification projects. These include the need to access deeper coal seams and the use of new techniques for modelling the process. [ABSTRACT FROM AUTHOR]

What does it mean to read Stuart Hall from South Africa, in relation to South Africa, and with South Africa in mind? This paper engages 'what's left of the debate' between Marxism and postcolonialism as politico-theoretical projects by refusing the opposition of compartmentalized scholarly fields, and by positing a conjunctural postcolonial-postsocialist praxis necessary for interpreting contemporary South Africa (as elsewhere.) Drawing on Hall's notion of 'moments' as both spatial and temporal, and assembled in the work of representation, I draw together insights from three moments in Hall's work: his foundational essay for the apartheid predicament, 'Race, Articulation and Societies Structured in Dominance'; the collectively written Policing the Crisis and particularly its remarkable conclusion which speaks to the criminalization of poor people's struggles; and his later thoughts on 'the end of innocence' with respect to coalitional Black politics. Reflecting on aspects of my research on 20th-century Durban, I suggest why these three moments must be seen in relation to each other, as a constellation that points, through the legacies of the Black Radical Tradition, to as yet unnamed postcolonial-postsocialist Marxisms of the future. [ABSTRACT FROM AUTHOR]